The Bohemian Forest, known in Czech as Šumava and in German as Böhmerwald, is a low mountain range in Central Europe. Geographically, the mountains extend from Plzeň Region and South Bohemia in the Czech Republic to Austria and Bavaria in Germany, and form the highest truncated uplands of the Bohemian Massif, up to 50 km wide. They create a natural border between the Czech Republic on one side and Germany and Austria on the other.For political reasons, the Bohemian and German sides have different names: in Czech, the Bohemian side is called Šumava and the Bavarian side Zadní Bavorský les , while in German, the Bohemian side is called Böhmerwald , and the Bavarian side Bayerischer Wald .